<template>
  <div class="login-container">
    <!-- 导航栏 -->
    <van-nav-bar class="page-nav-bar" title="标题">
       <van-icon slot="left" name="cross" @click="$router.back()" />
    </van-nav-bar>
    <!-- 表单 -->
    <van-form ref="loginFrom" @submit="onSubmit">
      <van-field v-model="user.mobile" name="mobile" placeholder="请输入手机号"
      :rules="userFromRules.mobile"
      type="number"
      maxlength="11">
      <i slot="left-icon" class="toutiao toutiao-shouji"></i>
      </van-field>

    <van-field v-model="user.code" name="code"   placeholder="请输入验证码" 
      :rules="userFromRules.code"
      type="number"
      maxlength="6"
      @click="onSendSms">
        <i slot="left-icon" class="toutiao toutiao-yanzhengma"></i>
        <template #button>
          <!-- 倒计时 -->
    <van-count-down
    v-if="isCountDownShow"
     :time="1000*60" 
     format="ss s"
     @finish=" isCountDownShow = false"
     />
      <!-- 发送验证码按钮 -->
    <van-button
    v-else
     round class="send-sms-btn" 
     native-type="button" size="small" type="primary">发送验证码</van-button>
  </template>
      </van-field>
      <div class="login-btn-wrap" style="margin: 16px">
        <van-button class="login-btn" block type="info" >登录</van-button>
      </div>
    </van-form>
  </div>
</template>

<script>
import {login,sendSms} from '@/api/user.js'
export default {
   data(){
     return{
      user:{
        mobile: '',
        code: ''
      },
      userFromRules:{
        mobile:[
          {
           required: true, 
           message: '手机号不能为空' 
          },
          {
          patten:/^1[3|5|7|8|]\d{9}$/,
          message:'手机号格式错误'
          }
        ],
        code:[
        {
          required: true, 
           message: '验证码不能为空'
        },{
          patten:/^\d{6}$/,
          message:'验证码格式错误'
        }
      ]
      },
      isCountDownShow:false //是否展示
     }
   },
   
  methods: {
    async onSubmit(values) {
      // 1 获取到用户输入的手机号和验证码
      const user = this.user


      // 2.表单验证
      this.$toast.loading({
        message: '加载中...',
        forbidClick: true,
        duration: 0
      });
      // 3 发送请求：
      //   A 准备能够请求的接口方法：在scr/api文件夹中创建一个 user.js
      //   B 引入得到能够发送请求的接口方法： import {login} from '@/api/user.js'
      //   C 调用login方法实现登录操作
      try {
        const res = await login(user)
        console.log(res);
        this.$store.commit('setUser', res.data.data)
        this.$toast.success('登录成功')
        
        // 登录成功以后，跳转到原来页面
       // back 的方式不严谨，后面我们会进行优化
        this.$router.back()
        // 调用mutations将数据保存在vuex当中
      } catch (err) {
        if (err.response.status === 400) {
          this.$toast.fail('手机号或验证码错误')
        } else {
          this.$toast.fail('登录失败，请稍后重试')
        }
      }

    },
    // 验证手机验证码
    async onSendSms(){
      // 1. 校验手机号
      try{
      await this.$refs.loginFrom.validate('mobile')
      }catch(err){
       return console.log('验证失败',err);
      }
      // 2. 验证通过，显示倒计时
      this.isCountDownShow = true
      // 3. 请求发送验证码 
      try{
        await sendSms(this.user.mobile)
        this.$toast('发送成功')
      }catch(err){
        this.isCountDownShow = false
        console.log(err);
        if (err.response && err.response.status === 429) {
          this.$toast('发送频繁，稍后重试')
        } else{
          this.$toast('发送失败，请稍后重试')
        }
      }
    }
  },
};
</script>

<style lang="less" scoped>
.login-container {
  .toutiao{
    font-size: 37px;
  }
  .send-sms-btn{
    height: 46px;
    line-height: 46px;
    background-color: #ededed;
    font-size: 22px;
    color: #666;
  }
  .login-btn-wrap{
    padding: 53px 33px;
    .login-btn{
       background-color: #6db4fb;
       border: none;
    }
  }
}
  .van-button--primary{
    border-color: #1989fa !important;
  }
</style>